ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A glass allowing the wetting of titanium has previously been developed. Two surface treatments promoting glass adhesion on titanium are compared: preoxidation and phosphatation combined with preoxidation. After preoxidation at 700 °C, a 1 μm-thick TiO2 layer covers titanium. The phosphated titanium substrates are oxidized at 600 °C to obtain a 20 μm-thick oxifluoride layer. After firing, glass adhesion is obtained with both surface treatments, but a “critical time of firing” appears with preoxidized titanium. WDS analysis suggests that diffusion of TiO2 into the glass is responsible for adhesion on preoxidized titanium, while a complex oxifluoride layer allows redox phenomena in the case of phosphated titanium. Pull-off tests have measured a maximum strength from 1.5 to 3 MPa whatever the surface treatment. Measurement of transverse crack densities in the vitreous coatings gives a higher value for phosphated than for preoxidized titanium. This confirms that better adhesion is obtained after phosphatation treatment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004407007593
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